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Measurements were made of the first constant of crystal anisotropy K1 and K⊥ = KN−2πJS2−K1 of the films, Fe, Ni, and Co, epitaxially grown on NaCl, LiF, and MgO crystals. Here KN is the constant of anisotropy perpendicular to the plane of a film, and JS is the saturation magnetization. The conclusion is drawn that the fact that K⊥ ≠ 0 in films cannot be explained only by stress. Stress accounts only for the difference between K1 of single-crystal films and K1 of in massive single crystals.

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